 //ts类型:boolean类型   
 
 let boo : boolean= true ;
 boo = false;


 //ts类型:number类型
let a : number = 1;
a = 10
console.log(a);
  //ts类型:string
  let str : string = '1234r4453w3yyjt'

  //ts类型:bigint
  let big : bigint = 123n;

    //ts类型:symbol
    let sy1 : symbol = Symbol();

